Nut-lock.



H. BARNETT.

NUT LOCK. APPLICATION FILED AUG.29. 1916.

ATTORNEYS Patented Feb. 27, 1917.

HORATIO BARNETT, or MALVERN, ARKANSAS.

NUT-LOCK.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Applicationfiled Augnst fzs, 1916. Serial No. 117,505.

To all whom it may concern:

Be. it known that I, HORATIO BARNETT, a citizen of the United States, and a resident of Malvern, in the county of Hot Spring and State of Arkansas, have invented a certain new and useful Improvement in Nut-Locks, of which the following is a specification.

My invention is an improvement in nut locks, and has for its object to provide a simple, inexpensive yet efiicient lock of the character specified, and to' provide a new v and improved form of tool for placing the lock.

In the drawings:

Figure 1 is a front view with parts in section, showing the improved lock and the placing tool with the lock in closed position;

Fig. 2 is a similar view showing the lock in open position;

Fig. 3 is a section on the line 33 of Fig. 1, looking in the direction of the arrows adjacent to the line; and

Fig. l is a perspective view ofthe lock attached. In the present embodiment of the invention, the nut lock is in the form of a split ring 1 of suitable dimensions, the said ring having at each side of the split andat the outer face of the ring, undercut notches or recesses 2, for a purpose to be presently described.

The opening of the ring is of lesser diam-- eter than that of the bolt 3, and the said ring is adapted to fit around the threaded portion of the bolt outside of the nut 4. The interior of the lock is provided with two series of teeth 5, the said series being at opposite sides of the diameter through the split. In the present instance, seven teeth are provided in each series, and while in practice the number may vious that there should be at least four and not more than seven in the series. the teeth, as and they are so shaped that they will engage the bottom of the groove of the thread and will bite into the material of the bolt when in place on the same. a

Each of the teeth has a broad base and while the outer face, that is, the face at the end of the ring is perpendicular to the axis of the ring, the inner face is inclined and concaved, as shown in split ring shown in be varied, it'is 0b- 7 Each of shown, is of pyramidal form,

Fig. 3, so that thev point of each toothmay enter and engage the bottom of the groove.

Av tool is provided .for placing the ring, the said tool comprising a pair of similar levers 6, each of which is provided at one end with a round lug 7 for entering the notch 2 of the ring, and adjacent to the lug each lever has a cam member 8. The cam members are so arranged that when the grip ends of the levers are swung together the lugs 7 will be gradually forced apart. Each lever is slotted transversely, as indicated at 9, at the cam members, and within the slots 9 is arranged an arc-shaped link 10. Each lever has a transverse pin 11 for pivotally and slidably connecting the link with the lever, and the link is of a length to permit the required movement in placing the lock. In use the locks are placed in the manner indicated in Figs. 1 and2. The tool is first engaged with the split ring, as shown in Fig. 1, the lugs 7 engagingthe notches 2, and with the grip ends of the levers widely separated, as shown. When so arranged, the nut being in place, the grip ends of the levers are swung toward each other and the will be enlarged or opened as Fig. 2. The ring is'now placed about the bolt in the manner indicated in Fig. 3, and the grip ends of the levers are again separated to permit the natural resiliency of the ring to close it on the bolt. The ring is seated close to the outer face of the nut and the teeth of each series will engage in the bottom of the groove and will bite into the metal of the bolt, firmly looking the nut in place. To remove the lock it .is' only necessary to reverse the operation of placing the lock.

portion free from teeth. This permits the teeth to engage the thread without damaging or marring the same. i

I claim 1; vA nut lock comprisinga split ring-having a lesser internal diameter than the bolt it is to engage, and having at the end remote from the nut a plurality of series of inwardly extending teeth adapted to engage the bottom of the groove of the thread, said ring having at each side of the split an ex ternal undercut notch fior engagement by a placing tool, the series ofteeth being at opposite sides of the split and the ring having a clear space free from teeth at the opposite side from the split.

2. A nut lock comprising a split ring having inwardly extending teeth at one end and shaped to engage the bottom of the groove of the thread of the bolt upon Which the lock is to be placed, said ring having at each side of the split an external notch for engagement by a tool to open and close the lock, and the tool comprising a pair of levers each having an outwardly extending lug for engaging a notch, and a rounded cam surface adjacent to the lug, said surface cooperating to spread the lugs when the other ends of the levers are moved toward each other, each lever having a transverse notch at the rounded cam portion, an arc-shaped slotted link extending through. the slots, and a pivot pin in connection With the levers and engaging the slot of the link;

3. A nut lock comprising a split ring having inwardly extending teeth at one end and shaped to engage the bottom of the groove of the thread of the bolt upon Which the lock is to be placed, said ring having at each side of the split an external notch for engagement by a tool to open and close the lock.

' HORATIO BARNETT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

